Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/include/linux/prefetch.h b/include/linux/prefetch.h
index af7c36a..a3bfbdf 100644
--- a/include/linux/prefetch.h
+++ b/include/linux/prefetch.h
@@ -29,7 +29,7 @@
 	prefetchw(x)	- prefetches the cacheline at "x" for write
 	spin_lock_prefetch(x) - prefetches the spinlock *x for taking
 	
-	there is also PREFETCH_STRIDE which is the architecure-prefered 
+	there is also PREFETCH_STRIDE which is the architecure-preferred 
 	"lookahead" size for prefetching streamed operations.
 	
 */